This document discusses the principles and philosophy of Linux. It identifies nine major tenets of the Linux philosophy including making each program do one thing well and being small, choosing portability over efficiency, and using software leverage. Each tenet is then explained in more detail with examples. The document also discusses how the Linux philosophy was derived from Unix and aims to provide users with control and flexibility through text-based configuration and chaining of small single-purpose programs.
Getting started with setting up embedded platform requires audience to understand some of the key aspects of Linux. This presentation deals with basics of Linux as an OS, Linux commands, vi editor, Shell features like redirection, pipes and shell scripting
Getting started with setting up embedded platform requires audience to understand some of the key aspects of Linux. This presentation deals with basics of Linux as an OS, Linux commands, vi editor, Shell features like redirection, pipes and shell scripting
It is a Unix like operating system.
It can run on 32 bit and 64 bit hardware.
Linux OS, is a freely distributable, cross-platform
Supports multiple processors.
True multi-tasking, multi-user OS.
Following are some of the important features of Linux Operating System.
Portable - Portability means softwares can works on different types of hardwares in same way.Linux kernel and application programs supports their installation on any kind of hardware platform.
Open Source - Linux source code is freely available and it is community based development project. Multiple teams works in collaboration to enhance the capability of Linux operating system and it is continuously evolving.
Multi-User - Linux is a multiuser system means multiple users can access system resources like memory/ ram/ application programs at same time.
Multiprogramming - Linux is a multiprogramming system means multiple applications can run at same time.
Hierarchical File System - Linux provides a standard file structure in which system files/ user files are arranged.
Shell - Linux provides a special interpreter program which can be used to execute commands of the operating system. It can be used to do various types of operations, call application programs etc.
Security - Linux provides user security using authentication features like password protection/ controlled access to specific files/ encryption of data.
Here, you can learn all information about Shell Script.
1. What is Shell Script?
2. Types of Shell Script.
3. Use of Shell Script.
4. Command line of Shell Script.
5. Example of Shell Script.
This presentation examines the way files are stored in Linux following the File System Hierarchy. It also addresses the recent proposals by Fedora to change this to merge bin directories.
differences between unix and linux:
Some people think Unix and Linux as synonyms, but that's not true. Many operating systems were developed to be like Unix but none of them got the popularity as Linux. Linux is the clone of Unix. It has several features similar to Unix, still have some key differences let us see in the presentation..
The presentation talks about Linux principles and philosophy. The Unix philosophy, originated by Ken Thompson, is a set of cultural norms and philosophical approaches to developing small yet capable software based on the experience of leading developers of the Unix operating system.
It is a Unix like operating system.
It can run on 32 bit and 64 bit hardware.
Linux OS, is a freely distributable, cross-platform
Supports multiple processors.
True multi-tasking, multi-user OS.
Following are some of the important features of Linux Operating System.
Portable - Portability means softwares can works on different types of hardwares in same way.Linux kernel and application programs supports their installation on any kind of hardware platform.
Open Source - Linux source code is freely available and it is community based development project. Multiple teams works in collaboration to enhance the capability of Linux operating system and it is continuously evolving.
Multi-User - Linux is a multiuser system means multiple users can access system resources like memory/ ram/ application programs at same time.
Multiprogramming - Linux is a multiprogramming system means multiple applications can run at same time.
Hierarchical File System - Linux provides a standard file structure in which system files/ user files are arranged.
Shell - Linux provides a special interpreter program which can be used to execute commands of the operating system. It can be used to do various types of operations, call application programs etc.
Security - Linux provides user security using authentication features like password protection/ controlled access to specific files/ encryption of data.
Here, you can learn all information about Shell Script.
1. What is Shell Script?
2. Types of Shell Script.
3. Use of Shell Script.
4. Command line of Shell Script.
5. Example of Shell Script.
This presentation examines the way files are stored in Linux following the File System Hierarchy. It also addresses the recent proposals by Fedora to change this to merge bin directories.
differences between unix and linux:
Some people think Unix and Linux as synonyms, but that's not true. Many operating systems were developed to be like Unix but none of them got the popularity as Linux. Linux is the clone of Unix. It has several features similar to Unix, still have some key differences let us see in the presentation..
The presentation talks about Linux principles and philosophy. The Unix philosophy, originated by Ken Thompson, is a set of cultural norms and philosophical approaches to developing small yet capable software based on the experience of leading developers of the Unix operating system.
Eduards Sizovs - Micro Service Architecture DevConFu
Eduards will talk about micro service architecture - approach to designing software when complex app is broken into tiny, cohesive services which are apps themselves. Anatomy of micro services will be covered with practical implementation advices in Java.
Slides de apresentação realizada no dia 27/10/2016 durante o evento QA Ninja Conf 2016.
Tópicos abordados:
- Dificuldades técnicas na implementação e execução de testes automatizados
- Mocking Test
- Exemplos no Visual Studio 2015
Writing Well-behaved Unix Utilities
A talk given at the London Ruby Users Group in October 2014. It's about what makes a good Unix utility, and how we can use Ruby to write our own.
It covers things like working as part of text processing pipelines, reading from ARGF, handling command-line arguments, and lots more.
Circuit breakers for Java: Failsafe, Javaslang-Circuitbreaker, Hystrix and Ve...Micha Kops
A demonstration of different implementations of the circuit-breaker pattern in Java to implement more resilient applications.
The following libraries are used: Failsafe, Javaslang-Circuitbreaker, Netflix Hystrix and Vert.x.
More details can be found the following blog article of mine:
http://www.hascode.com/2017/02/resilient-architecture-circuit-breakers-for-java-hystrix-vert-x-javaslang-and-failsafe-examples/
Microservice architectures have generated quite a bit of hype in recent months, and practitioners across our industry have vigorously debated the definition, purpose, and effectiveness of these architectures.
In this session, Matt Stine will cut through the Microservices hype and examine some very practical considerations:
• Not an End in Themselves: Microservices are really all about helping us achieve continuous delivery
• Systems over Services: Microservices are less about the services themselves and more about the systems we can assemble using them. Boilerplate patterns for configuration, integration, and fault tolerance are keys.
• Operationalized Architecture: Microservices aren’t a free lunch. You have to pay for them with strong DevOps sauce.
• It’s About the Data: Bounded contexts with API’s are great until you need to ask really big questions. How do we effectively wrangle all of the data at once?
Along the way, we’ll see how open source technology efforts such as Cloud Foundry, Spring Cloud, Netflix OSS, Spring XD, and Hadoop can help us with many of these considerations.
Mockito vs JMockit, battle of the mocking frameworksEndranNL
(Original keynote slides can be found at https://github.com/Endran/PublicSlides)
For years the industry standard of mocking on the JVM has been Mockito. Mockito is a wonderful library that really speeds up your testing by allowing you to create mocks in a very simple way. That being said, it does have its drawbacks, for which different strategies need to be deployed to keep your code testable. The main drawbacks are statics and finals. Final classes cannot be mocked, nor final methods, and also static methods are a no-go. To work with these type of things we need to wrap it, and copy the signature in a non final, non static way.
I have a great adversity against statics, I've devoted an entire post about it, in short; It hides dependencies and brings so little convenience at the costs of its drawbacks. Finals on the other hand have purpose, it helps messaging the goal of a class or method. Java is one of the few languages where classes and methods are open/virtual by default and have to be closed/final by explicit action. In (for example) Kotlin, everything is final by default, if you do not want something to be final, you should use the open keyword.
No matter if you follow the principle of making things final, static or not, if you are using Mockito the decision has been made. This mocking framework demands that everything is non-final, demands that everything is designed to be extended, since it might need to be mocked away. We should be able to improve upon this, and by the name of this post, you should be able to guess which framework will save the day. JMockit will help us with our impediments, and will give some other nifty benefits as well!
(ARC317) Maintaining a Resilient Front Door at Massive Scale | AWS re:Invent ...Amazon Web Services
The Netflix service supports more than 50 million subscribers in over 40 countries around the world. These subscribers use more than 1,000 different device types to connect to Netflix, resulting in massive amounts of traffic to the service. In our distributed environment, the gateway service that receives this customer traffic needs to be able to scale in a variety of ways while simultaneously protecting our subscribers from failures elsewhere in the architecture. This talk will detail how the Netflix front door operates, leveraging systems like Hystrix, Zuul, and Scryer to maximize the AWS infrastructure and to create a great streaming experience.
SCS 4120 - Software Engineering IV
BACHELOR OF SCIENCE HONOURS IN COMPUTER SCIENCE
BACHELOR OF SCIENCE HONOURS IN SOFTWARE ENGINEERING
All in One Place Lecture Notes
Distribution Among Friends Only
All copyrights belong to their respective owners
Viraj Brian Wijesuriya
vbw@ucsc.cmb.ac.lk
Microservices vs. The First Law of Distributed Objects - GOTO Nights Chicago ...Phil Calçado
TALK #2: Microservices vs. The First Law of Object Design
We've been breaking systems and application into smaller components for a long time now. From Component-Based Design to Distributed Objects to SOA to what is today's preferred golden hammer: microservices.
One definition of microservices is that it is a flavor of SOA that emphasizes many specialize services versus a few more generalist ones. Often these microservices are so small that they take care of a single "object". Distributed objects aren't new to this industry, and in 2003, Martin Fowler wrote a classic article where he discusses several problems with this model, and proposes the First Law of Distributed Objects:
"Objects have been around for a while, and sometimes it seems that ever since they were created, folks have wanted to distribute them. However, distribution of objects, or indeed of anything else, has a lot more pitfalls than many people realize, especially when they're under the influence of vendors' cozy brochures. This article is about some of these hard lessons-lessons I've seen many of my clients learn the hard way... my First Law of Distributed Object Design: Don’t distribute your objects!"
Reinventing the wheel is nothing new in our field, but if microservices are meant to be small, how can we avoid the same problems from the past? What are the technologies, architectures, protocols, and practices we need in place to make sure that our microservices architecture isn't just the largest bowl of spaghetti this organization has ever cooked?
SPEAKER: Phil Calçado, Director of Software Engineering at DigitalOcean
Phil Calçado works at DigitalOcean, where he helps build the cloud for developers. Before that, he spent four years building the team and architecture behind SoundCloud's move from a monolith to microservices. He tweets at @pcalcado writes at http://philcalcado.com.
This slide deck dives a bit in history to understand where IT comes from, where we are now and why we are there and what our options are. It starts with exploring the paradigms of the markets companies live in, travels through matching organizational approaches and finally looks at the history and current state of IT.
Based on that and after a quick look at Conway's law the market paradigms and organizational approaches are evaluated with respect to the drivers they imply on IT in general and architecture particularly.
And after all that foreplay (which is necessary to really understand where we are and what the forces are) several architectural styles and technologies are located on the scale that the market paradigms and organizational approaches span. This way sort of an "architectural fitness detector" is provided which helps to make architectural choices based on needs instead of hypes or habits (which are way to often the choice drivers).
The slide deck then finishes up with a few mismatches that are seen quite often in reality and it can be seen how the distance between architectural choices on the presented scale can be used to quickly determine potential mismatches.
As always the voice track is missing but I hope that the slides are still of some help for you.
This slide deck is about the production-readiness of software. First it explains why production-ready is more important than just feature-complete.
Then it takes a quick detour to DevOps. It explains the core ideas of DevOps and how this talks relates to the concepts of DevOps (by simulating the feedback loop from ops to dev while the wall between dev and ops still exists).
After this detour the needs of the administrators from the ops department are briefly described and the challenges that arise from that for developers who want to provide production-ready software.
Based on those challenges a selection of design principles are described (mostly in terms of topics to take care of in the design and implementation process). While not being complete by far, taking care of the topics described on these slides are a huge step towards production-ready software based on my experience.
Of course all the information from the voice track is missing, it is slides only. Even though the slides just carry a fraction of the information, I hope they will still contain some good pointers for you that help you to create better production-ready software.
A Roadmap for Students Using FOSS (Free and Open Source Software) and Reachin...PK Mishra
The talk opens with the usefulness of Open Source Software in the context of evolution of UNIX and Linux. It goes on to suggest and agenda for students who can enhance their abilities and contribute towards making themselves and India self-reliant. A few useful suggestions as action points have also been made.
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
Speakers:
👨🏫 Andras Palfi, Senior Product Manager, UiPath
👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
Encryption in Microsoft 365 - ExpertsLive Netherlands 2024Albert Hoitingh
In this session I delve into the encryption technology used in Microsoft 365 and Microsoft Purview. Including the concepts of Customer Key and Double Key Encryption.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
1. DONE BY: ALIA BIN TOUQ
Linux Principles and
Philosophy
2. Investigating Linux's Principles and Philosophy
You can frequently select
A product or technology on purely
pragmatic grounds—what OS works well
for a given task, which software suite is the
least expensive, and so on.
This is true of some Linux users; the open
source model of Linux, “Selecting an
Operating System,” has implications that
can affect how Linux works. Furthermore,
some people in the Linux world can
become quite passionate about these
principles.
3. Nine major tenets
There are nine major tenets to the Linux
philosophy.
Small is Beautiful
Each Program Does One Thing Well
Prototype as Soon as Possible
Choose Portability Over Efficiency
Store Data in Flat Text Files
Use Software Leverage
Use Shell Scripts to Increase Leverage and
Portability
Avoid Captive User Interfaces
Make Every Program a Filter
4. Make every program a filter
Each of the commands that make up this command line
program is a filter. That is each command will take an input,
usually from Standard Input, and “filters” the data stream by
making some change to it, then sends the resulting data stream
to Standard Output. Standard Input and Standard Output are
known collectively as STDIO.
5. Small is beautiful and
Each program does one thing well
These two tenets go hand in hand.
Each of the commands in this program
is fairly small, and each performs a
specific task. The sort command, for
example does only one thing. It sorts
the data stream sent to it via Standard
Input and sends the results to
Standard Output. It can perform
numeric, alphabetic and alphanumeric
sorts in forward and reverse order. But
it does nothing else.
6. Choose portability over efficiency and
Use shell scripts to increase leverage and
portability
The portability of shell scripts can be far more efficient
in the long run than the perceived efficiency of writing a
program in a compiled language—not even considering
the time required to compile and test such a program—
because they can run on many otherwise incompatible
systems.
7. Use software leverage
Software leverage means a couple things to me. First, and in the context of
this example, it means that by using four command line commands, we are
leveraging the work of the programmers who created those commands with
over 7,000 lines of C code. That is code that we do not have to create. We are
leveraging the efforts of those other, under-appreciated programmers to
accomplish the task we have set for ourselves.
8. Impact
This article is not meant to be a programming tutorial. Rather, it is
intended to illustrate how the Linux Philosophy impacts and
informs the daily work of system administrators and developers.
We are the beneficiaries of decades of code that was well-designed,
well-thought out, and well-written by people who had a lot of skin in
the game and actually knew what they were doing.
The best code on the planet was written using these tenets.
9. The impact of the Linux philosophy
When Unix was being developed in the late
1960s and early 1970s, the developers were
intent upon building an operating system
that was significantly different from the
operating systems that preceded.
The philosophy of Unix was markedly
different from that of other operating
systems. And the Linux philosophy is quite
naturally derived directly from the Unix
philosophy.
10. Enlightenment
Over the years a number of people have attempted to enlighten the rest of us
when they codified various aspects of the Linux philosophy.
Mike Gancarz first wrote The Unix Philosophy and then followed it up
with Linux and the Unix Philosophy. These books list 9 major tenets and 10
lesser tenets.
Eric Raymond has 17 Unix rules in his book, The Art of Unix programming.
And, Oregon State University has it's own Linux philosophy which I think nicely
depicts an engineer's view of Linux.
11. The terminal case
The Linux philosophy is epitomized by the ease with which one can open a
terminal emulator to access the CLI and its concomitant power.
First, there are the multiple virtual terminals that can be accessed using the
Ctrl-Alt-F [1-7] keys.
Even the Linux GUI desktops whispers, "Use the force, Luke," to all who use
them. Linux has several fine GUI desktop environments from which to choose
so that every user can choose the one he or she likes best.
12. Complete control
Linux does not handhold. It assumes you know what you are doing when you
type a command and it proceeds to execute that command without asking if
you really want to. It gives you complete control.
Other operating systems let you know that
you can use nails but don't tell you what
tool is used to insert the nails let alone
allow you to put your own finger on the
trigger.
Yes, there is danger where there is great
power. Used wisely that power can also be
harnessed to accomplish many great
things.
13. The Linux prime directive
This amounts to allowing each user to do
things her or his own way with a wide choice
of powerful tools.
It means making flexibility, simplicity, and
freedom the foremost considerations when
designing and building software systems.
It has resulted in the creation of software that
is such a work of art that it is still beautiful
and going strong after almost 45 years for
Unix and for more than 20 years for Linux.
14. Linux Principles
Everything is a file. ( Including hardware )
Small, single-purpose programs.
Ability to chain programs together to perform
complex tasks.
Avoid captive user interfaces.
Configuration data stored in text.
15. Everything is a File : –
UNIX systems have many powerful utilities designed to
create and manipulate files. The UNIX security model is
based around the security of files. By treating everything as
a file, a consistency emerges. You can secure access to
hardware in the same way as you secure access to a
document.
16. Small, single-purpose programs :
UNIX provides many small
utilities that perform one
task very well. When new
functionality is required,
the general philosophy is to
create a separate program
– rather than to extend an
existing utility with new
features.
17. Ability to chain programs together to
perform complex tasks :-
A core design feature
of UNIX is that the
output of one program
can be the input for
another. This gives the
user the flexibility to
combine many small
programs together to
perform a larger, more
complex task.
18. Avoid captive user interfaces :-
Interactive commands are rare in UNIX. Most
commands expect their options and arguments
to be typed on the command line when the
command is launched.
The command completes normally, possibly
producing output, or generates an error
message and quits. Interactivity is reserved for
programs where it makes sense, for example,
text editors (of course, there are non-
interactive text editors too.)
19. Configuration data stored in text : –
Text is a universal interface, and many UNIX utilities exist to manipulate
text.
Storing configuration in text allows an administrator to move a
configuration from one machine to another easily.
There are several revision control applications that enable an
administrator to track which change was made on a particular day, and
provide the ability to roll back a system configuration to a particular date
and time.
20. References
Eric Raymond: The Art of Unix Programming
http://www.catb.org/~esr/writings/taoup/html/index.html
Mike Gancarz: Linux and the Unix Philosophy; Digital Press,
2003, ISBN 1-55558-273-7
Wikipedia: http://en.wikipedia.org/wiki/Unix_philosophy
Oregon State University:
http://web.engr.oregonstate.edu/~traylor/ece474/lecture_verilog
/beamer/linux_philosophy.pdf